/* roulang page: index */
:root {
      --color-primary: #0f172a;
      --color-secondary: #1e293b;
      --color-teal: #0d9488;
      --color-teal-light: #14b8a6;
      --color-bg-light: #f8fafc;
      --color-border: #e2e8f0;
    }
    body {
      background-color: var(--color-bg-light);
      color: #334155;
      font-family: system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", sans-serif;
      line-height: 1.7;
      letter-spacing: -0.01em;
    }
    .hero-stack-container {
      perspective: 1000px;
    }
    .card-shadow {
      box-shadow: 0 4px 20px -2px rgba(15, 23, 42, 0.05);
    }
    .card-shadow-hover:hover {
      box-shadow: 0 12px 28px -4px rgba(15, 23, 42, 0.1);
      transform: translateY(-2px);
    }
    .smooth-transition {
      transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    }